package main

import (
	"time"
)

func main() {

	m2()
	return
	m()
	return
	go printNum()
	go printLetter()
	num <- true
	time.Sleep(time.Second * 5)
	return
	wuHuanChong()
	return
	var ch = make(chan int, 10)
	go Producer(ch)
	go Consumer(ch)
	time.Sleep(time.Second * 5)

}
